This is with the xxx30 Course Reserve libraries and the ILL libraries. There about 80 of these. Having to constantly be restarting these is a major inconvenience.

Resolution:[From site:]

I opened TAR#6174365.993 -- we've tried a lot of things. Results: the ue_01 applications appear to be losing a connection to the database when times between documents exceed 1 hour.I made a change which has fixed this problem. In sqlnet.ora, added parameter:

Explanation:DCD(Dead COnnection Detection) is initiated on the server when a connection is established. At this time SQL*Net reads theSQL*Net parameter files and sets a timer to generate an alarm. The timer interval is set by providing a non-zero value in minutes(30) for the SQLNET.EXPIRE_TIME parameter in the sqlnet.ora file.

When the timer expires, SQL*Net on the server sends a "probe" packet to the client. The probe is essentially an empty SQL*Net packet and does not represent any form of SQL*Net level data, but it creates data traffic on the underlying protocol and resets most internal network time